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LM5041A: 使用外置误差放大器时,REF引脚电压异常

Part Number: LM5041A
Other Parts Discussed in Thread: LM5041

使用LM5041做电流馈电推挽拓扑,使用外部误差放大器,禁用内部误差放大器,LM5041的FB引脚接地;在上电初期,由于误差放大器输出电压与REF引脚电压同时上升,导致REF引脚输出电压只有1.86V左右,而不能达到5V,从而导致整个芯片不能正常工作。请问这是什么原因造成的?该如何处理呢?